我通常从六点十五分锻炼到七点。

I usually exercise from six fifteen to seven.

电影在七点十五分开始。

The movie starts at fifteen minutes past seven.

他们七点十五分在剧场外和你碰头.

They will meet you outside the theater at 7:15.

袭击发生在一层的走廊中，大概在早上七点十五分的时候。

The attack happened in a first-floor hallway at about 7:15 a. m.